On Wed, Jul 22, 2015 at 02:58:01PM +0530, Archit Taneja wrote:
> Some drm drivers call remove_conflicting_framebuffers. Create a
> drm_fb_helper function that wraps around these calls.
>
> This is part of an effort to prevent drm drivers from calling fbdev
> functions directly, in order to make fbdev emulation a top level drm
> option.
>
> v2:
> - Added kerneldocs
> - Follow the drm way of aligning of arguments in func definitions
>
> Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_fb_helper.c | 15 +++++++++++++++
> include/drm/drm_fb_helper.h | 4 ++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 9620aa5..86e4e2c 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -894,6 +894,21 @@ void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
> }
> EXPORT_SYMBOL(drm_fb_helper_set_suspend);
>
> +/**
> + * drm_fb_helper_remove_conflicting_framebuffers - wrapper around
> + * remove_conflicting_framebuffers
> + * @fb_helper: driver-allocated fbdev helper
> + *
> + * A wrapper around remove_conflicting_framebuffers implemented by fbdev core
> + */
> +int drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
> + const char *name,
> + bool primary)
> +{
> + return remove_conflicting_framebuffers(a, name, primary);
> +}
> +EXPORT_SYMBOL(drm_fb_helper_remove_conflicting_framebuffers);
Chris Wilson reported on irc that if he builds with I915_FBDEV=n then
there's a missing symbol problem here because i915 wants to kick out other
framebuffers (well we have to for correctness) even when fbdev emulation
is disabled. If you look at i915_dma.c you'll see that the call to
remove_conflicting_framebuffers is conditional upon CONFIG_FB and not
CONFIG_I915_FBDEV.
I think the proper solution here would be to provide a static inline
helper for remove_conflicting_framebuffer itself when CONFIG_FB=n, since a
all drivers who call this still want to call this even when fbdev
emulation is disabled.
Plan B would be to move this into core drm and make the static inline one
selected for CONFIG_FB=n. If you do that then maybe also rename it to
drm_remove_conflicting_framebuffer since this really is only tangetial to
fbdev emulation.
Anyway current patch unfortunately won't work since we really must remove
other framebuffers even in the FB=y, I915_FBDEV=n case. So I dropped it
from drm-misc for now. Unfortunately that means all the driver conversions
won't apply anymore either :(
Thanks, Daniel
> +
> static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
> u16 blue, u16 regno, struct fb_info *info)
> {
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index ef32500..cbdc69d 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -168,6 +168,10 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info,
>
> void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state);
>
> +int drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
> + const char *name,
> + bool primary);
> +
> int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
>
> int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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